发明名称 |
Preparation of phosphonic acid derivatives |
摘要 |
A method for the preparation of alkene phosphonic acids and salts thereof, such as VDPA (vinylidene diphosphonic acid) is disclosed. The products can be produced in a stable, substantially pure form and in high yield. The method includes the azeotropic removal of water from salts of alpha-hydroxy-alkane diphosphonic acid dimer or corresponding acids thereof, and the pyrolysis of the dehydrated reactant at a temperature of from 170° C. to 300° C. There may be included a step to convert anhydrides which have been formed during the pyrolysis. The method may include the use of heat transfer agents and/or bases, and may be carried out at elevated or reduced pressure.
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申请公布号 |
US6215013(B1) |
申请公布日期 |
2001.04.10 |
申请号 |
US20000582967 |
申请日期 |
2000.09.05 |
申请人 |
RHODIA CONSUMER SPECIALTIES LIMITED |
发明人 |
WOODWARD GARY;BRIERLEY TIMOTHY KEVIN;PADDA RANBIR SINGH;HARRIS JOHN CHRISTOPHER;HAYES AIDAN MICHAEL |
分类号 |
C07F9/38;C07F9/6571;(IPC1-7):C07F9/40 |
主分类号 |
C07F9/38 |
代理机构 |
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主权项 |
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地址 |
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